Diet and exercise are two of the common strategies to reduce weight. In fact, they're truly the only two ways to lose weight for good. But for some reason, the research on this subject is apparently inconcluive. Meaning, whether a diet-plus-exercise intervention is more effective for weight loss than a diet-only intervention in the long-term has not been conclusively established.
However, brand new research, published in January 2009 in the journal Obesity Reviews, has finally answered this age-old question!